STPS30120CTN Equivalent & Substitute Parts

Part Overview

The STPS30120CTN is a Schottky diode array manufactured by STMicroelectronics, configured as 1 pair common cathode with 120 V reverse voltage rating and 15 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format and is classified as obsolete product status. Due to its obsolete classification, equivalent substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Substiute Parts

STPS30120CTN

STMicroelectronicsIn Stock: 1933STPS30120CTN Datasheet

Current PartRFQ

STPS30120CT

STMicroelectronicsIn Stock: 4342STPS30120CT Datasheet

DirectRFQ

MBR30120CT

SMC Diode SolutionsIn Stock: 1506MBR30120CT Datasheet

DirectRFQ

NTST30120CTG

onsemiIn Stock: 2215NTST30120CTG Datasheet

SimilarRFQ

SBR30120CT

Diodes IncorporatedIn Stock: 834SBR30120CT Datasheet

SimilarRFQ

SBR30A120CT-G

Diodes IncorporatedIn Stock: 1578SBR30A120CT-G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS30120CTN is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Diode Configuration: 1 Pair Common Cathode (mandatory match)
• Voltage - DC Reverse (Vr) (Max): 120 V (mandatory match)
• Current - Average Rectified (Io) (per Diode): 15 A (mandatory match)
• Package / Case: TO-220-3 (mandatory match)
• Mounting Type: Through Hole (mandatory match)

Secondary Compatibility Parameters:

• Technology: Schottky or Super Barrier (functionally compatible within specified voltage and current ratings)
• Voltage - Forward (Vf) (Max) @ If: Acceptable range 830 mV to 1.08 V @ 15 A
• Speed: Fast Recovery or Standard Recovery (both acceptable for 120 V applications)
• Current - Reverse Leakage @ Vr: Acceptable range 1 µA to 800 µA @ 120 V
• Operating Temperature - Junction: Minimum -65°C to maximum 175°C acceptable
• RoHS Status: ROHS3 Compliant (required)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (required)

Parts are classified as direct substitutes when all primary criteria and RoHS/MSL compliance are met. Parts are classified as similar substitutes when primary criteria are met but product status or secondary parameters show minor variations.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority Order):

1. STPS30120CT (STMicroelectronics) - Active product status. Identical electrical specifications to STPS30120CTN with matching forward voltage (920 mV @ 15 A), reverse leakage (15 µA @ 120 V), and fast recovery speed. Same manufacturer ensures design continuity. Highest inventory availability (4303 pcs). Preferred for direct replacement in active production.

2. SBR30A120CT-G (Diodes Incorporated) - Active product status. Meets all primary substitution criteria with superior forward voltage performance (830 mV @ 15 A), lower reverse leakage (100 µA @ 120 V), and extended operating temperature range (-65°C to 175°C). Super Barrier technology provides enhanced performance characteristics. Suitable for new designs and field replacements.

3. SBR30120CT (Diodes Incorporated) - Active product status. Meets all primary substitution criteria with forward voltage of 890 mV @ 15 A and reverse leakage of 500 µA @ 120 V. Standard recovery speed (>500 ns) is acceptable for 120 V applications. Extended operating temperature range (-65°C to 175°C). Adequate inventory (776 pcs).

Similar Substitutes (Limited Availability):

4. MBR30120CT (SMC Diode Solutions) - Active product status. Meets primary substitution criteria with forward voltage of 900 mV @ 15 A and extended operating temperature range (-55°C to 175°C). Current rating not specified in documentation. REACH Status is Affected. Suitable for applications where SMC Diode Solutions qualification is acceptable.

5. NTST30120CTG (onsemi) - Obsolete product status. Meets primary substitution criteria but exhibits higher forward voltage (1.08 V @ 15 A) and significantly higher reverse leakage (800 µA @ 120 V). Operating temperature range limited to -40°C to 150°C. Not recommended for new production due to obsolete status and inferior electrical characteristics.

Selection Basis:

• STPS30120CT is the primary recommendation due to active product status, identical specifications, and same manufacturer lineage.
• SBR30A120CT-G and SBR30120CT are secondary recommendations for applications requiring extended temperature range or superior forward voltage performance.
• All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) rating.
• Obsolete parts (NTST30120CTG) should be avoided for new production.

Frequently Asked Questions (FAQ)

Q: Can STPS30120CT directly replace STPS30120CTN without circuit modification?

A: Yes. STPS30120CT is a direct substitute with identical electrical specifications. Both devices feature 120 V reverse voltage, 15 A average rectified current, 920 mV forward voltage @ 15 A, and TO-220-3 packaging. The primary difference is product status: STPS30120CTN is obsolete while STPS30120CT is active. No circuit modifications are required.

Q: What is the difference between Schottky and Super Barrier technology in these diodes?

A: Both technologies are acceptable substitutes within the specified 120 V and 15 A parameters. Schottky diodes (STPS30120CT, MBR30120CT, NTST30120CTG) and Super Barrier diodes (SBR30120CT, SBR30A120CT-G) meet the primary substitution criteria. Super Barrier devices typically exhibit lower forward voltage and reverse leakage characteristics, as shown in the parameter comparison table.

Q: Are the TO-220-3 packages from different manufacturers physically interchangeable?

A: Yes. All substitute parts use TO-220-3 through-hole packaging with identical mechanical dimensions and pin configurations. Physical board layout and thermal management considerations remain unchanged. Supplier device package variations (TO-220AB Narrow Leads vs. TO-220) do not affect mechanical compatibility.

Q: Why does MBR30120CT not specify current rating?

A: The current rating for MBR30120CT is not provided in the available documentation. However, the part is listed as a substitute with 120 V reverse voltage and TO-220-3 packaging. For applications requiring confirmed 15 A current rating, STPS30120CT or SBR30A120CT-G are preferred selections.

Q: Can NTST30120CTG be used as a substitute despite obsolete status?

A: NTST30120CTG meets primary substitution criteria but is classified as obsolete. Additionally, it exhibits higher forward voltage (1.08 V @ 15 A) and significantly higher reverse leakage (800 µA @ 120 V) compared to the original STPS30120CTN. For new production, active alternatives (STPS30120CT, SBR30A120CT-G, SBR30120CT) are strongly preferred.

Q: What is the significance of the operating temperature range differences?

A: The original STPS30120CTN specifies maximum junction temperature of 175°C. Substitute parts with extended ranges (e.g., SBR30A120CT-G: -65°C to 175°C) provide broader thermal operating margins. Parts with limited ranges (e.g., NTST30120CTG: -40°C to 150°C) may not be suitable for applications requiring full 175°C operation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). This ensures compliance with environmental and regulatory requirements equivalent to the original STPS30120CTN.

Q: What inventory considerations should guide part selection?

A: STPS30120CT offers the highest inventory availability (4303 pcs), followed by SBR30A120CT-G (1538 pcs) and NTST30120CTG (2200 pcs). For immediate procurement, STPS30120CT is the optimal choice. For long-term supply chain resilience, qualifying multiple active alternatives (SBR30A120CT-G, SBR30120CT) is recommended.